Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Payroll expenses and taxes payable	$ 336,000	$ 123,000
Commissions and bonuses payable and general accrued liabilities	784,000	2,670,000
Accrued liabilities	$ 1,120,000	$ 2,793,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2020 has been prepared using information from the audited consolidated balance sheet as of that date.